1. AMK Kronoberg, Kronoberg County Centre for Competence in Primary Health Care, Kronoberg, Sweden;
2. Department of Research and Development, Växjö, Sweden;
3. Division of Occupational and Environmental Medicine, Institute of Laboratory Medicine, Lund University, Lund, Sweden;
4. Department of Clinical Sciences, General Practice/Family Medicine, Lund University, Malmö, Sweden